Added support for the `openrouter/openrouter/quasar-alpha` model. Currently free on OpenRouter. Quasar scored 55% on the polyglot coding benchmark Run with `aider --model quasar` Offer OpenRouter OAuth authentication if an OpenRouter model is specified but the API key is missing. Prevent retrying API calls when the provider reports insufficient credits. Improve URL detection to exclude trailing double quotes. Bumped deps to pickup litellm change to properly display the root cause of OpenRouter "choices" errors. Improve error message for OpenRouter API connection issues to mention potential rate limiting or upstream provider issues.

Configure weak models (`gemini/gemini-2.0-flash` and `openrouter/google/gemini-2.0-flash-exp:free`) for Gemini 2.5 Pro models. Add model metadata for `openrouter/google/gemini-2.0-flash-exp:free`. Updated deps for yanked fsspec and aiohttp packages #3699 Removed redundant dependency check during OpenRouter OAuth flow, by Claudia Pellegrino. Aider wrote 86% of the code in this release. https://aider.chat/HISTORY.html